diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/Makefile.am | 1 | ||||
| -rw-r--r-- | src/expr/last.c | 118 | ||||
| -rw-r--r-- | src/expr_ops.c | 2 |
3 files changed, 121 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index 90b1967..c3b0ab9 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -34,6 +34,7 @@ libnftnl_la_SOURCES = utils.c \ expr/flow_offload.c \ expr/fib.c \ expr/fwd.c \ + expr/last.c \ expr/limit.c \ expr/log.c \ expr/lookup.c \ diff --git a/src/expr/last.c b/src/expr/last.c new file mode 100644 index 0000000..0020fbc --- /dev/null +++ b/src/expr/last.c @@ -0,0 +1,118 @@ +/* + * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published + * by the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <stdio.h> +#include <stdint.h> +#include <arpa/inet.h> +#include <errno.h> +#include <inttypes.h> + +#include <linux/netfilter/nf_tables.h> + +#include "internal.h" +#include <libmnl/libmnl.h> +#include <libnftnl/expr.h> +#include <libnftnl/rule.h> + +struct nftnl_expr_last { + uint64_t msecs; +}; + +static int nftnl_expr_last_set(struct nftnl_expr *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_expr_last *last = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_LAST_MSECS: + memcpy(&last->msecs, data, sizeof(last->msecs)); + break; + default: + return -1; + } + return 0; +} + +static const void *nftnl_expr_last_get(const struct nftnl_expr *e, + uint16_t type, uint32_t *data_len) +{ + struct nftnl_expr_last *last = nftnl_expr_data(e); + + switch (type) { + case NFTNL_EXPR_LAST_MSECS: + *data_len = sizeof(last->msecs); + return &last->msecs; + } + return NULL; +} + +static int nftnl_expr_last_cb(const struct nlattr *attr, void *data) +{ + int type = mnl_attr_get_type(attr); + const struct nlattr **tb = data; + + if (mnl_attr_type_valid(attr, NFTA_LAST_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case NFTA_LAST_MSECS: + if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nftnl_expr_last_build(struct nlmsghdr *nlh, const struct nftnl_expr *e) +{ + struct nftnl_expr_last *last = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_LAST_MSECS)) + mnl_attr_put_u64(nlh, NFTA_LAST_MSECS, htobe64(last->msecs)); +} + +static int +nftnl_expr_last_parse(struct nftnl_expr *e, struct nlattr *attr) +{ + struct nftnl_expr_last *last = nftnl_expr_data(e); + struct nlattr *tb[NFTA_LAST_MAX + 1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_expr_last_cb, tb) < 0) + return -1; + + if (tb[NFTA_LAST_MSECS]) { + last->msecs = be64toh(mnl_attr_get_u64(tb[NFTA_LAST_MSECS])); + e->flags |= (1 << NFTNL_EXPR_LAST_MSECS); + } + + return 0; +} + +static int nftnl_expr_last_snprintf(char *buf, size_t len, + uint32_t flags, + const struct nftnl_expr *e) +{ + struct nftnl_expr_last *last = nftnl_expr_data(e); + + return snprintf(buf, len, "last %"PRIu64" ", last->msecs); +} + +struct expr_ops expr_ops_last = { + .name = "last", + .alloc_len = sizeof(struct nftnl_expr_last), + .max_attr = NFTA_LAST_MAX, + .set = nftnl_expr_last_set, + .get = nftnl_expr_last_get, + .parse = nftnl_expr_last_parse, + .build = nftnl_expr_last_build, + .snprintf = nftnl_expr_last_snprintf, +}; diff --git a/src/expr_ops.c b/src/expr_ops.c index 3538dd6..7248e4f 100644 --- a/src/expr_ops.c +++ b/src/expr_ops.c @@ -14,6 +14,7 @@ extern struct expr_ops expr_ops_dup; extern struct expr_ops expr_ops_exthdr; extern struct expr_ops expr_ops_fwd; extern struct expr_ops expr_ops_immediate; +extern struct expr_ops expr_ops_last; extern struct expr_ops expr_ops_limit; extern struct expr_ops expr_ops_log; extern struct expr_ops expr_ops_lookup; @@ -57,6 +58,7 @@ static struct expr_ops *expr_ops[] = { &expr_ops_exthdr, &expr_ops_fwd, &expr_ops_immediate, + &expr_ops_last, &expr_ops_limit, &expr_ops_log, &expr_ops_lookup, |